Fast acquisition for Galileo CBOC signal

In this paper, a fast parallel acquisition unit with combination of data and pilot components for Galileo CBOC receiver is presented. Due to secondary code and high rate data, the coherent time is limited by bit transition, so code serial acquisition in this unit is adopt while carrier frequencies are scanned in parallel based on FFT. Coherent time can be extended with the assistant of secondary code and data code. In this unit, coherent time, non-coherent times as well as code rate are configurable via interface to MCU, which enable user to adjust to variant situations. Theoretical analyses and simulation performances are given for different configurations. Details for implementation in different cases of this unit are further discussed, and finally, improvement consideration for code phase parallel scan is given.